/**
 * NHAZCA GSD Calculator - Styles
 * Brand Colors:
 * - Primary Red: #871724
 * - Electric Blue gradients for accents
 */

/* ============================================================================
   CSS Variables
   ============================================================================ */
:root {
    --nhazca-red: #871724;
    --nhazca-red-dark: #6a1220;
    --nhazca-red-light: #a91d2e;

    --nhazca-blue-dark: #0a1628;
    --nhazca-blue-mid: #1a3a5c;
    --nhazca-blue-electric: #00b4d8;
    --nhazca-blue-light: #48cae4;
    --nhazca-blue-glow: #00ffff;
    --nhazca-blue-grey: rgba(40, 40, 41, 0.95);
    --nhazca-dark-background: #212529;

    --gradient-blue-dark: linear-gradient(135deg, #0a1628 0%, #1a3a5c 50%, #0d47a1 100%);
    --gradient-blue-electric: linear-gradient(135deg, #1a3a5c 0%, #00b4d8 50%, #48cae4 100%);
    --gradient-blue-glow: linear-gradient(135deg, #00b4d8 0%, #90e0ef 100%);

    --shadow-soft: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.15);
    --shadow-strong: 0 15px 35px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 180, 216, 0.3);

    --btn-primary-hover-gradient: linear-gradient(135deg, var(--primary-hover-start) 0%, var(--primary-hover-end) 100%);
    --btn-primary-active-gradient: linear-gradient(135deg, var(--primary-active-start) 0%, var(--primary-active-end) 100%);
    --dark-color: var(--brand-surface-dark);
    --light-color: var(--brand-surface);
    --white-color: #ffffff;
    --white-rgb: 255, 255, 255;
    --black-color: #000000;
    --black-rgb: 0, 0, 0;
    --soft-white-color: #f8fbfb;
    --paper-color: #f8f9fa;
    --paper-muted-color: #f5f5f5;
    --muted-text-on-dark: #e8edf2;

    --bs-secondary-color: rgba(222, 226, 230, 0.75);
}

/* ============================================================================
   Global Styles
   ============================================================================ */
body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: #f8f9fa;
}

/* ============================================================================
   Brand Elements
   ============================================================================ */
.brand-nhazca {
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(90deg, #fff 0%, var(--nhazca-blue-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(72, 202, 228, 0.5);
}

.brand-nhazca-nav {
    font-weight: 700;
    letter-spacing: 1px;
    color: #fff;
}

.brand-subtitle {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-left: 0.5rem;
}

.brand-link {
    text-decoration: none;
}

.brand-divider
 {
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, transparent 0%, rgba(var(--white-rgb), 0.3) 50%, transparent 100%);
    margin: 0 1rem;
}

/* ============================================================================
   Buttons
   ============================================================================ */
.hero .btn-primary, .auth-container .btn-primary {
    background: linear-gradient(135deg, #0d6efd 0%, #00d4ff 100%);
    border: none;
    box-shadow: 0 8px 20px rgba(0, 212, 255, 0.4);
    position: relative;
    overflow: hidden;
}


.hero .btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    min-width: 230px;
    flex: 1 1 240px;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    white-space: nowrap;
}


   .btn-primary {
    --bs-btn-color: #fff;
    --bs-btn-bg: #0d6efd;
    --bs-btn-border-color: #0d6efd;
    --bs-btn-hover-color: #fff;
    --bs-btn-hover-bg: #0b5ed7;
    --bs-btn-hover-border-color: #0a58ca;
    --bs-btn-focus-shadow-rgb: 49, 132, 253;
    --bs-btn-active-color: #fff;
    --bs-btn-active-bg: #0a58ca;
    --bs-btn-active-border-color: #0a53be;
    --bs-btn-active-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
    --bs-btn-disabled-color: #fff;
    --bs-btn-disabled-bg: #0d6efd;
    --bs-btn-disabled-border-color: #0d6efd;
}

   .btn-nhazca-red {
    background-color: var(--nhazca-red);
    border-color: var(--nhazca-red);
    color: #fff;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-nhazca-red:hover {
    background-color: var(--nhazca-red-dark);
    border-color: var(--nhazca-red-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(135, 23, 36, 0.4);
}

.btn-nhazca-blue {
    background: var(--gradient-blue-electric);
    border: none;
    color: #fff;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-nhazca-blue:hover {
    background: var(--gradient-blue-glow);
    color: var(--nhazca-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-outline-nhazca {
    border-color: var(--nhazca-blue-electric);
    color: var(--nhazca-blue-mid);
}

.btn-outline-nhazca:hover,
.btn-check:checked + .btn-outline-nhazca {
    background-color: var(--nhazca-blue-electric);
    border-color: var(--nhazca-blue-electric);
    color: #fff;
}

/* ============================================================================
   Landing Page
   ============================================================================ */
.landing-page {
    min-height: 100vh;
    overflow-x: hidden;
}

.hero {
    min-height: 100vh;
    background: url('/static/img/nhazca_cover.jpg') center/cover no-repeat;
    position: relative;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(10, 22, 40, 0.85) 0%,
        rgba(26, 58, 92, 0.7) 50%,
        rgba(10, 22, 40, 0.8) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    padding: 2rem;
}

.hero-text {
    padding: 2rem;
}

.text-muted {
    --bs-text-opacity: 1;
    color: var(--bs-secondary-color) !important;
}

.hero-tagline {
    max-width: 500px;
}

/* ============================================================================
   Login Card (Landing Page)
   ============================================================================ */
.login-card {
    background: var(--nhazca-blue-grey);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: var(--shadow-strong), var(--shadow-glow);
    max-width: 400px;
    width: 100%;
    overflow: hidden;
    animation: slideIn 0.5s ease-out;
}


.login-card .form-control {
    display: block;
    width: 100%;
    padding: .375rem .75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #fff;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-color: #2a2a2b;
    background-clip: padding-box;
    border: 1px solid #444;
    border-radius: var(--bs-border-radius);
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
}

.login-card .form-control:focus {
    background-color: #2a2a2b;
    color: #fff;
    border-color: var(--nhazca-blue-light);
    box-shadow: 0 0 0 0.2rem rgba(0, 174, 239, 0.25);
}

.login-card .form-control::placeholder {
    color: #888;
}

.invalid-feedback {
    color: var(--nhazca-blue-glow);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card-header {
    background: var(--nhazca-blue-grey);
    color: #fff;
    padding: 1.5rem 2rem 0.5rem;
    text-align: center;
}

.login-card-header h3 {
    font-weight: 600;
}

.login-card-subtitle {
    color: var(--nhazca-blue-light);  /* Uses the electric blue from CSS variables */
    opacity: 0.9;
}

.login-card-body {
    padding: 2rem;
    color: #fff
}

.signup-link {
    color: var(--nhazca-blue-glow);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s;
}

.signup-link:hover {
    color: var(--nhazca-red-dark);
    text-decoration: underline;
}

/* ============================================================================
   Auth Pages (Signup, Verify)
   ============================================================================ */
.auth-page {
    min-height: 100vh;
    background: var(--gradient-blue-dark);
    display: flex;
    flex-direction: column;
}

.auth-container {
    flex: 1;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: var(--shadow-strong);
    max-width: 450px;
    width: 100%;
    overflow: hidden;
}

.auth-card-header {
    background: var(--gradient-blue-electric);
    color: #fff;
    padding: 2rem;
    text-align: center;
}

.auth-card-body {
    padding: 2rem;
}

.verification-code-input {
    font-size: 1.5rem;
    letter-spacing: 0.5rem;
    text-align: center;
    font-weight: 600;
}

/* ============================================================================
   Dashboard
   ============================================================================ */
.dashboard-page {
    background: linear-gradient(180deg, #e8f4f8 0%, #f8f9fa 100%);
    min-height: 100vh;
}

.bg-nhazca {
    background: var(--gradient-blue-dark) !important;
}

.bg-nhazca-gradient {
    background: var(--gradient-blue-electric) !important;
}

/* Settings Card */
.settings-card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    overflow: hidden;
}

.settings-card .card-header {
    border-bottom: none;
    padding: 1rem 1.25rem;
}

.sensor-info {
    background: #f8f9fa;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    border-left: 3px solid var(--nhazca-blue-electric);
}

.sensor-card .form-control::placeholder {
    color: #4d4d4d95;
}

/* Reference Card */
.reference-card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-soft);
}

/* Diagram Card */
.diagram-card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    background: #fff;
}

.diagram-card .card-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(0, 180, 216, 0.2);
}

.diagram-card .card-header h6 {
    color: var(--nhazca-blue-mid);
    font-weight: 600;
}

.diagram-card img {
    border-radius: 4px;
}

.text-description {
    font-size: medium;
    color: #000000;
    margin-bottom: 0;
}

/* ============================================================================
   Calculator Accordion
   ============================================================================ */
.calculator-accordion .accordion-item {
    border: none;
    border-radius: 12px !important;
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-medium);
    overflow: hidden;
}

.calculator-accordion .accordion-button {
    background: #fff;
    font-size: 1rem;
    /* padding: 1.25rem 1.5rem; */
    padding: 0.7rem 0.5rem;
}

.calculator-accordion .accordion-button:not(.collapsed) {
    /* background: linear-gradient(90deg, #067eed 0%, #fff 100%); */
    background: var(--gradient-blue-electric);
    color: var(--white-color);
    box-shadow: none;
}

.calculator-accordion .accordion-button:focus {
    box-shadow: none;
    border-color: var(--nhazca-blue-electric);
}

.calculator-accordion .accordion-button::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%231a3a5c'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}

.calculator-accordion .accordion-body {
    padding: 0.5rem 1.5rem 0.5rem 1.5rem;
    background: #fff;
}

/* Calculator Form */
.calculator-form .form-label {
    font-weight: 500;
    color: #495057;
    font-size: 0.9rem;
}

.form-label-dark {
    color: var(--nhazca-blue-grey);
}

.form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 0.3rem 0.5rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    border-color: var(--nhazca-blue-electric);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.15);
}

/* ============================================================================
   Results Panel
   ============================================================================ */
.results-panel {
    background: linear-gradient(135deg, #e8f4f8 0%, #f0f9ff 100%);
    border-radius: 12px;
    padding: 1.5rem;
    border-left: 4px solid var(--nhazca-blue-electric);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-panel h6 {
    color: var(--nhazca-blue-mid);
    margin-bottom: 1rem;
    font-weight: 600;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(0, 180, 216, 0.2);
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    color: #6c757d;
    font-size: 0.9rem;
}

.result-value {
    font-weight: 600;
    color: var(--nhazca-blue-dark);
    font-size: 1rem;
    text-align: right;
}

/* ============================================================================
   Form Controls
   ============================================================================ */
.form-select {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 0.6rem 1rem;
}

.form-select:focus {
    border-color: var(--nhazca-blue-electric);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.15);
}

/* ============================================================================
   Alerts & Flash Messages
   ============================================================================ */
.flash-messages {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1060;
    width: 100%;
    max-width: 600px;
}

.alert {
    border-radius: 5px;
    border: none;
    box-shadow: var(--shadow-medium);
    background-color: #444;
    color: white;
}

/* ============================================================================
   Navbar
   ============================================================================ */
.navbar {
    box-shadow: var(--shadow-soft);
}

.navbar-brand {
    display: flex;
    align-items: center;
}

/* ============================================================================
   Error Pages
   ============================================================================ */
.error-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-blue-dark);
    color: #fff;
    text-align: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 800;
    line-height: 1;
    background: var(--gradient-blue-glow);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================================================
   Responsive Adjustments
   ============================================================================ */
@media (max-width: 992px) {
    .hero-text {
        text-align: center;
        margin-bottom: 2rem;
    }

    .hero-tagline {
        margin: 0 auto;
    }

    .login-card {
        margin: 0 auto;
    }

    .brand-nhazca {
        font-size: 2.5rem;
    }
}

@media (max-width: 576px) {
    .hero-content {
        padding: 1rem;
    }

    .login-card-body,
    .auth-card-body {
        padding: 1.5rem;
    }

    .result-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .result-value {
        text-align: left;
        margin-top: 0.25rem;
    }
}

/* ============================================================================
   Animations
   ============================================================================ */
.btn {
    transition: all 0.3s ease;
}

.card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.settings-card:hover,
.reference-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--nhazca-blue-electric);
    outline-offset: 2px;
}